diff --git a/src/ddo/DDO.ts b/src/ddo/DDO.ts
index 2852921..0be52d6 100644
--- a/src/ddo/DDO.ts
+++ b/src/ddo/DDO.ts
@@ -38,12 +38,12 @@ export class DDO {
      * DID, descentralized ID.
      * @type {string}
      */
-    id: string
-    created: string
-    publicKey: PublicKey[]
-    authentication: Authentication[]
-    service: Service[]
-    proof: Proof
+    public id: string
+    public created: string
+    public publicKey: PublicKey[]
+    public authentication: Authentication[]
+    public service: Service[]
+    public proof: Proof
 
     public constructor(ddo?: Partial<DDO>) {
         this.created = (ddo && ddo.created) || new Date(Date.now()).toISOString().replace(/\.[0-9]{3}/, "")
diff --git a/src/ocean/OceanAgreements.ts b/src/ocean/OceanAgreements.ts
index 1ff1053..674170c 100644
--- a/src/ocean/OceanAgreements.ts
+++ b/src/ocean/OceanAgreements.ts
@@ -1,11 +1,14 @@
 import AquariusProvider from "../aquarius/AquariusProvider"
+import BrizoProvider from "../brizo/BrizoProvider"
 import Account from "./Account"
 import DID from "./DID"
-import ServiceAgreement from "./ServiceAgreements/ServiceAgreement"
 import IdGenerator from "./IdGenerator"
-import BrizoProvider from "../brizo/BrizoProvider"
+import ServiceAgreement from "./ServiceAgreements/ServiceAgreement"
 
-export type agreementPreparionResult = {agreementId: string, signature: string}
+export interface AgreementPreparionResult {
+    agreementId: string
+    signature: string
+}
 
 /**
  * Agreements submodule of Ocean Protocol.
@@ -35,13 +38,13 @@ export default class OceanAgreements {
      * @param  {string} did Decentralized ID.
      * @param  {string} serviceDefinitionId Service definition ID.
      * @param  {Account} consumer Consumer account.
-     * @return {Promise<agreementPreparionResult>} Agreement ID and signaturee.
+     * @return {Promise<AgreementPreparionResult>} Agreement ID and signaturee.
      */
     public async prepare(
         did: string,
         serviceDefinitionId: string,
         consumer: Account,
-    ): Promise<agreementPreparionResult> {
+    ): Promise<AgreementPreparionResult> {
 
         const d: DID = DID.parse(did as string)
         const ddo = await AquariusProvider.getAquarius().retrieveDDO(d)
@@ -52,7 +55,6 @@ export default class OceanAgreements {
         return {agreementId, signature}
     }
 
-
     /**
      * Submit a service agreement to the publisher to create the agreement on-chain.
      * @param  {string} did Decentralized ID.